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68c97aef | 1 | /* Timed low level locking for pthread library. Generic futex-using version. |
d614a753 | 2 | Copyright (C) 2003-2020 Free Software Foundation, Inc. |
68c97aef RM |
3 | This file is part of the GNU C Library. |
4 | Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
68c97aef RM |
19 | |
20 | #include <atomic.h> | |
21 | #include <errno.h> | |
22 | #include <lowlevellock.h> | |
23 | #include <sys/time.h> | |
48123656 | 24 | #include <time.h> |
68c97aef RM |
25 | |
26 | ||
27 | int | |
21507801 | 28 | __lll_clocklock_wait (int *futex, int val, clockid_t clockid, |
59213094 | 29 | const struct timespec *abstime, int private) |
68c97aef | 30 | { |
21507801 | 31 | struct timespec ts, *tsp = NULL; |
68c97aef | 32 | |
21507801 | 33 | if (abstime != NULL) |
68c97aef | 34 | { |
21507801 AZ |
35 | /* Reject invalid timeouts. */ |
36 | if (! valid_nanoseconds (abstime->tv_nsec)) | |
37 | return EINVAL; | |
68c97aef | 38 | |
21507801 | 39 | /* Get the current time. This can only fail if clockid is not valid. */ |
59213094 MC |
40 | if (__glibc_unlikely (__clock_gettime (clockid, &ts) != 0)) |
41 | return EINVAL; | |
68c97aef RM |
42 | |
43 | /* Compute relative timeout. */ | |
21507801 AZ |
44 | ts.tv_sec = abstime->tv_sec - ts.tv_sec; |
45 | ts.tv_nsec = abstime->tv_nsec - ts.tv_nsec; | |
46 | if (ts.tv_nsec < 0) | |
68c97aef | 47 | { |
21507801 AZ |
48 | ts.tv_nsec += 1000000000; |
49 | --ts.tv_sec; | |
68c97aef RM |
50 | } |
51 | ||
21507801 | 52 | if (ts.tv_sec < 0) |
68c97aef RM |
53 | return ETIMEDOUT; |
54 | ||
21507801 | 55 | tsp = &ts; |
68c97aef RM |
56 | } |
57 | ||
21507801 AZ |
58 | /* If *futex == val, wait until woken or timeout. */ |
59 | lll_futex_timed_wait (futex, val, tsp, private); | |
60 | ||
68c97aef RM |
61 | return 0; |
62 | } |